Journal
SOFT MATTER
Volume 15, Issue 29, Pages 6006-6013Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sm00772e
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Funding
- NSF-CMMI [1748049, 1740011]
- Alexander von Humboldt Foundation - Federal Ministry of Education and Research in Germany
- Max Planck Society
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1740011] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1748049] Funding Source: National Science Foundation
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We experimentally investigate the effect of lipid charge on the stiffness of bilayer membranes. The bending rigidity of membranes with composition 0-100 mol% of charged lipids, in the absence and presence of salt at different concentrations, is measured with the flicker spectroscopy method, using the shape fluctuations of giant unilamellar vesicles. The analysis considers both the mean squared amplitudes and the time autocorrelations of the shape modes. Our results show that membrane charge increases the bending rigidity relative to the charge-free membrane. The effect is diminished by the addition of monovalent salt to the suspending solutions. The trend shown by the membrane bending rigidity correlates with zeta potential measurements, confirming charge screening at different salt concentrations. The experimental results in the presence of salt are in good agreement with existing theories of membrane stiffening by surface charge.
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